JPH07274056A - Hand shake correction device for camera - Google Patents

Abstract

PURPOSE:To provide a hand shake correction device of a camera suitable for miniaturization and weight reduction by inhibiting the use of a member for keeping balance. CONSTITUTION:In this hand shake correction device 10 of a video camera provided with gimbal mechanisms 12 and 13 for supporting a lens barrel 11 for supporting the photographing lens of the video camera rotatably in a pitching direction and in a yawing direction and actuators 14 and 15 for drive- controlling the lens barrel in the pitching direction and in the yawing direction, the rotary shafts H and V in the pitching direction and in the yawing direction of the gimbal mechanisms are passed through the centroid of a movable part composed of the lens barrel and the rotor part of the actuators rotated integrally with the lens barrel.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera shake correcting method and apparatus for supporting a camera, for example, a lens barrel of a video camera rotatably in a pitching direction and a yawing direction, and controlling the attitude in an absolute space. It is a thing.

[0002]

2. Description of the Related Art Conventionally, for example, a gimbal mechanism has been adopted as a method for correcting camera shake of a video camera during shooting. A video camera provided with a camera shake correction device using this gimbal mechanism is configured as shown in FIG. 7, for example. Referring to FIG. 7, a video camera 1 includes a lens barrel 2 that supports a taking lens thereof, a bearing 3 that is rotatable about an H axis.
The inner frame 3 is supported by a and 3b, and the outer frame 4 is supported by bearings 4a and 4b so as to be rotatable around the V axis.

The lens barrel 2 is supported by a so-called gimbal mechanism so as to be rotatable about the H-axis, that is, in the pitching direction, and around the V-axis, that is, in the yawing direction, approximately at the center of gravity thereof. .

Further, actuators 5 and 6 are incorporated in the bearings 3b and 4b, respectively. In FIGS. 7 and 8, the actuator 5 is a flat actuator, and includes a magnet 5a and an iron printed board 5b.
And a plane facing type.

The magnet 5a is integrally attached to the lens barrel 2 in the vicinity of the bearing 3b, and the N pole and the S pole are alternately magnetized to have multiple poles. It is magnetized.

The printed board 5b is integrally attached to the inner frame 3 in the vicinity of the bearing 3b, and a plurality of plane coils 5c, four in the illustrated case, are provided on the surface facing the magnet 5a. In addition, one Hall element 5d is mounted between the coils 5c.

Thus, in the actuator 5, the magnet 5a serves as a rotor and the printed board 5b serves as a stator.

Similarly, the actuator 6 shown in FIG. 7 is a flat actuator and has a magnet 6a.
And a printed board 6b made of iron.

The magnet 6a is integrally attached to the inner frame 3 near the bearing 4b, and the N pole and the S pole are alternately magnetized in multiple poles.

The printed board 6b is integrally attached to the outer frame 4 near the bearing 4b and has a plurality of plane coils 6c on the surface facing the magnet 6a. Between the coils 6c,
One Hall element (not shown) for detecting the rotation of the magnet is attached.

As a result, in the actuator 6, similarly, the magnet 6a serves as a rotor, and the printed board 6
b will be configured as a stator.

Thus, by appropriately energizing the coils 5c and 6c of the actuators 5 and 6, the actuators 5 and 6 are drive-controlled, and the lens barrel 2 is rotationally driven in the pitching direction with respect to the inner frame 3. Moreover, the inner frame 3 is rotationally driven in the yawing direction with respect to the outer frame 4. As a result, the attitude of the lens barrel 2 is controlled in absolute space, and camera shake of the video camera 1 is corrected.

[0013]

However, in the video camera 1 having such a configuration, the H-axis and the V-axis pass through the center of gravity of the lens barrel 2, that is, the optical axis, and are orthogonal to each other. There is. Therefore, the above H-axis and V
Since the camera shake correction device is designed by giving priority to the axis passing through the optical axis of the lens barrel 2, the lens barrel 2, the inner frame 3,
The center of gravity of the entire movable portion including the outer frame 4 and the rotors of the actuators 5 and 6, that is, the magnets 5a and 6a, deviates from the H axis and the V axis.

For this reason, in order to make the center of gravity of the movable portion coincide with the center of gravity of the lens barrel 2, a member such as a balance weight for balancing is added to the movable portion. Therefore, the weight of the video camera 1 is increased by the weight of the member for achieving the above balance, which violates the demand for downsizing and weight saving of the video camera 1.

In view of the above points, an object of the present invention is to provide a camera shake correction device suitable for downsizing and weight saving by not using a member for balancing.

[0016]

According to the present invention, a gimbal mechanism for rotatably supporting a lens barrel supporting a photographing lens of a camera in a pitching direction and a yawing direction and a pitching of the lens barrel are provided. Direction and yawing direction drive control, and the center of gravity of the movable part composed of the lens barrel and the rotor portion of the actuator in which the rotation axes of the gimbal mechanism in the pitching direction and the yawing direction are integrally rotated. This is achieved by a camera shake compensator of a camera that is configured to match.

According to the second invention, the above object is
A lens barrel that supports the taking lens of the camera, an inner frame that rotatably supports this lens barrel in the pitching direction, an outer frame that rotatably supports this inner frame in the yawing direction, and this lens barrel in the pitching direction. A first actuator that controls driving, and a second actuator that controls driving of the inner frame in a yawing direction, and a rotation shaft of the inner frame that rotates integrally with the lens barrel and the lens barrel. Of the movable portion composed of the rotor portion of the second actuator, which is configured to pass through the center of gravity of the movable portion composed of the rotor portion of the actuator, and the rotation axis of the outer frame is integrally rotated with the lens barrel and the inner frame. With a camera shake correction device that is configured to pass through the center of gravity,
To be achieved.

[0018]

According to the above construction, the rotation axes in the pitching direction and the yawing direction pass through the center of gravity of the movable portion including the lens barrel and the rotor portion of the actuator that rotates integrally with the lens barrel. It is not necessary to correct the weight balance of the movable portion including the lens barrel with respect to the rotation axis. Therefore, a member for balancing the movable part such as a balance weight is not required.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described in detail below with reference to FIGS. It should be noted that the examples described below are suitable specific examples of the present invention, and therefore, various technically preferable limitations are given, but the scope of the present invention particularly limits the present invention in the following description. Unless otherwise stated, the present invention is not limited to these modes.

FIG. 1 shows the construction of a video camera incorporating an embodiment of the image stabilization apparatus according to the present invention.
In FIG. 1, the video camera 10 includes a movable plate 12 that supports a lens barrel 11 that supports the photographing lens so as to be rotatable about an H axis, and a movable plate 12 that is rotatable about a V axis. And a pitching and yawing actuator 14 and 15.

As shown in the figure, the movable plate 12 has an inverted L-shaped cross section, and a vertical portion 12a on its side.
The stators 14a and 15a provided with the coils of the actuator 14 and the actuator 15 are fixed on the upper and horizontal portions 12b, respectively. The stators 14a and 15a of the actuators 14 and 15 are connected to each other via a connecting portion 16 as shown in FIGS. In addition, the stator 14a includes the movable plate 12
Are mounted so as to be embedded in a concave portion defined by a step provided on the vertical portion 12a.

The rotor 14b of the actuator 14
Has a disk-like shape as shown in the drawing, and the protruding portion protruding outward in the radial direction of the lens barrel 11 is inserted through the groove portions 12c and 12d provided in the vertical portion 12a of the movable plate 12. It is attached to the bosses 11a and 11b. In this case, the mounting is performed by screwing the bosses 11a and 11b, but the mounting is not limited to this, and the mounting may be performed by means such as adhesion, fitting, and engagement.

Here, the groove portions 12c and 12d are formed in a long arc shape centering on the rotation center of the rotor 14b. As a result, when the rotor 14b is rotationally driven, the bosses 11a and 11b of the lens barrel 11 or the mounting screws slide in the groove portions 12c and 12d, so that the lens barrel 11 rotates the rotation axis of the rotor 14b. It is designed to be stably rotated while being guided around.

The fixed plate 13 is, as shown in the figure,
The cross section is formed in an inverted L shape and is fixed to a fixed portion (not shown) of the video camera, and the rotor 15b of the actuator 15 is attached to the lower surface of the horizontal portion 13a above the fixed portion. There is.

FIG. 4 shows the structure of the actuator 15. As shown in FIG. 4, the bearing 22, the sleeve 23, the bearing 24, and the stator coil 25 are mounted on the housing 21. Then, after fixing the stator coil 25 to the housing 21 with the screw 26, the rotor magnet 27 and the rotor case 28 are placed on the stator coil 25, and the back yoke 2 is arranged from below.
9 is attached.

Here, the stator coil 25 is formed by arranging a plurality of plane coils on the printed circuit board so as to face the rotor magnet 27. The rotor magnet 27 is formed in a ring shape, and is configured such that S poles and N poles are alternately magnetized in multi-poles at predetermined angles in the circumferential direction.

Thus, the rotor 15b including the rotor magnet 27 and the rotor case 28 is rotatably supported by the stator 15a including the stator coil 25 via the bearings 22 and 24. Thus,
The actuator 15 is assembled as shown in FIG. In FIG. 5, reference numeral 30 is a magnetic sensor for rotation detection, in this case, an MR sensor.

The actuator 14 has the same structure as the actuator 15 shown in FIG. 4, and is assembled as shown in FIG.

Thus, when the actuator 14 is driven, the rotor 14b thereof is rotationally driven together with the lens barrel 11 in the pitching direction around the H axis.

Further, since the rotor 15b of the actuator 15 is fixed to the fixed plate 13 at the time of driving, the stator 15a is rotationally driven around the V axis in the yawing direction together with the movable plate 12. .

Here, the rotation axis of the actuator 14 is set so as to pass through the lens barrel 11 and the rotor 14b portion of the actuator 14, that is, the center of gravity of the movable portion with respect to the H axis. The rotation axis of the actuator 15 is set so as to pass through the lens barrel 11, the movable plate 12, the actuator 14 and the stator 15a portion of the actuator 15, that is, the center of gravity of the movable portion with respect to the V axis.

The video camera 10 incorporating the image stabilization apparatus according to this embodiment is constructed as described above.
By appropriately energizing the stator coils 25 of the actuators 14 and 15,
15 is drive-controlled. As a result, the lens barrel 11 is rotationally driven with respect to the movable plate 12 around the H axis in the pitching direction, and the movable plate 12 is rotationally driven with respect to the fixed plate 13 around the V axis in the yawing direction. Thus, the lens barrel 11
Is controlled in absolute space, and the camera shake of the video camera 10 is corrected.

In this case, since the rotary shafts of the actuators 14 and 15 pass through the center of gravity of the movable part with respect to the rotary shafts respectively, in order to balance the movable parts,
Since it is not necessary to add a member such as a balance weight, the structure is lightweight.

As described above, according to the embodiment described above,
Since the rotating shafts in the pitching direction and the yawing direction are configured to pass through the center of gravity of the movable portion including the lens barrel and the rotor portion of the actuator that rotates integrally with the lens barrel, the balance of the movable portion such as the balance weight is balanced. A member for taking out is unnecessary. As a result, the image stabilizer is reduced in weight, which contributes to the reduction in size and weight of the entire video camera.

Although the lens barrel 11 of the video camera 10 is supported by the gimbal mechanism including the movable plate 12 and the fixed plate 13 in the above-described embodiment, the present invention is not limited to this, and the gimbal having another structure is used. By a mechanism, for example, a gimbal mechanism with an inner frame and an outer frame shown in FIG. 7,
Obviously, it may be supported.

[0036]

As described above, according to the present invention, a camera shake correction device suitable for downsizing and weight saving can be provided by not using a member for balancing.

[Brief description of drawings]

FIG. 1 is a schematic perspective view showing a video camera incorporating an embodiment of an image stabilization apparatus according to the present invention.

FIG. 2 is an exploded perspective view of a camera shake correction device of the video camera of FIG.

3 is a cross-sectional view showing a configuration of a camera shake correction device of the video camera of FIG.

FIG. 4 is an exploded perspective view of an actuator used in the image stabilizer of the video camera of FIG.

FIG. 5 is a sectional view showing an actuator for driving yawing.

FIG. 6 is a cross-sectional view showing an actuator for driving pitching.

FIG. 7 is a cross-sectional view showing a configuration of an example of a camera shake correction device in a conventional video camera.

8 is an exploded perspective view of an actuator used in the image stabilizing apparatus of FIG.

[Explanation of symbols]

 10 video camera 11 lens barrel 12 movable plate 13 fixed plate 14 actuator 15 actuator H pitching direction V yawing direction

Claims (2)

[Claims] 1. A lens barrel for supporting a taking lens of a camera,
A gimbal mechanism that rotatably supports in the pitching direction and the yawing direction, and an actuator that drives and controls the lens barrel in the pitching direction and the yawing direction, and the rotation axes of the gimbal mechanism in the pitching direction and the yawing direction are the mirrors. A camera shake correction device for a camera, which is configured to coincide with a center of gravity of a movable portion including a rotor portion of an actuator that is rotated integrally with a barrel and a lens barrel. 2. A lens barrel for supporting a taking lens of a camera, an inner frame for rotatably supporting the lens barrel in a pitching direction, an outer frame for rotatably supporting the inner frame in a yawing direction, and the mirror. A first actuator for driving and controlling the barrel in the pitching direction and a second actuator for driving and controlling the inner frame in the yawing direction are provided, and the rotation axis of the inner frame is integrated with the barrel and the barrel. A rotor portion of a second actuator configured to pass through the center of gravity of a movable portion including a rotor portion of a rotated first actuator, and a rotation axis of an outer frame being integrally rotated with the lens barrel and the inner frame. A camera shake compensator for a camera, characterized in that it is configured so as to pass through the center of gravity of a movable part consisting of.